io_uring/net: use right helpers for async recycle

We have a helper that checks for whether a request contains anything in
->async_data or not, namely req_has_async_data(). It's better to use it
as it might have some extra considerations.

Fixes: 43e0bbbd ("io_uring: add netmsg cache")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b7414da4e7c3c32c31fc02dfd1355af4ccf4ca5f.1660566179.git.asml.silence@gmail.comSigned-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/net.c

@@ -116,7 +116,7 @@ static void io_netmsg_recycle(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_async_msghdr *hdr = req->async_data;
 
-	if (!hdr || issue_flags & IO_URING_F_UNLOCKED)
+	if (!req_has_async_data(req) || issue_flags & IO_URING_F_UNLOCKED)
 		return;
 
 	/* Let normal cleanup path reap it if we fail adding to the cache */